An analysis of nicotine (MW = 162 g/mol) gives 74.0% carbon, 8.65% hydrogen, and 17.3% nitrogen. What is the TRUE (MOLECULAR) formula for nicotine? 1. C6H8N5 2. C5H7N 3. C9H12N3 4. C4H5N2 5. C8H10N4 6. C4H5N4 7. C11H16N 8. C10H14N2 9. C12H4N

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice